linux-kernel - Re: [PATCH v11 2/6] dt-bindings: display/msm: dp-controller: document QCS8300 compatible

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Message-ID: <p2okyfwfl23bip65koaqezlvhyo3z47bnugojcieuspr37xc7b@s3qwgbqmts4l>
Date: Thu, 4 Sep 2025 16:43:52 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yongxing Mou <yongxing.mou@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 2/6] dt-bindings: display/msm: dp-controller:
 document QCS8300 compatible

On Thu, Sep 04, 2025 at 03:22:37PM +0800, Yongxing Mou wrote:
> Add compatible string for the DisplayPort controller found on the
> Qualcomm QCS8300 SoC.
> 
> The Qualcomm QCS8300 platform comes with one DisplayPort controller
> that supports 4 MST streams.
> 
> Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
> ---
>  .../bindings/display/msm/dp-controller.yaml        | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> index aeb4e4f36044a0ff1e78ad47b867e232b21df509..ad08fd11588c45698f7e63ecc3218a749fc8ca67 100644
> --- a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> +++ b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
> @@ -18,6 +18,7 @@ properties:
>    compatible:
>      oneOf:
>        - enum:
> +          - qcom,qcs8300-dp

Can we use fallback to qcom,sa8775p-dp instead of declaring a completely
new one?

>            - qcom,sa8775p-dp
>            - qcom,sc7180-dp
>            - qcom,sc7280-dp
> @@ -195,6 +196,7 @@ allOf:
>            compatible:
>              contains:
>                enum:
> +                - qcom,qcs8300-dp
>                  - qcom,sa8775p-dp
>                  - qcom,x1e80100-dp
>        then:
> @@ -295,6 +297,26 @@ allOf:
>            minItems: 6
>            maxItems: 8
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              # QCS8300 only has one DP controller that supports 4
> +              # streams MST.
> +              - qcom,qcs8300-dp
> +    then:
> +      properties:
> +        reg:
> +          minItems: 9
> +          maxItems: 9
> +        clocks:
> +          minItems: 8
> +          maxItems: 8
> +        clocks-names:
> +          minItems: 8
> +          maxItems: 8
> +
>  additionalProperties: false
>  
>  examples:
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry